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Neurological soft signs in schizophrenia
J Schröder1, R Niethammer, F J Geider
1Department of Psychiatry, University of Heidelberg, F.R.G.
Schizophrenia Research
|December 1, 1991
Summary
A new scale for neurological soft signs (NSS) reliably measures these neurological alterations. Findings link NSS to clinical course and specific brain changes, particularly in the basal ganglia.
Area of Science:
- Neuroscience
- Psychiatry
- Clinical Psychology
Background:
- Neurological soft signs (NSS) are subtle indicators of neurological dysfunction.
- Existing scales for NSS may lack comprehensive validation or specific factor structures.
Purpose of the Study:
- To develop and validate a new, reliable scale for assessing NSS.
- To investigate the associations between NSS, clinical course, and brain alterations.
Main Methods:
- A 17-item scale for NSS was constructed from existing literature.
- Internal and interrater reliability were assessed using Cronbach's alpha and correlation coefficients.
- Factor analysis identified five underlying factors of NSS.
- Associations with clinical course (using BPRS subscales) and brain morphology were examined.
Main Results:
- The new NSS scale demonstrated high internal (Cronbach's alpha=0.83) and interrater (0.88) reliability.
- Factor analysis revealed five NSS dimensions: motor coordination, integrative functions, complex motor tasks, spatial orientation, and hard signs.
- NSS scores varied with clinical course and correlated significantly with thought disorder (BPRS subscale).
- 'Motor coordination' signs were associated with morphological changes in the basal ganglia.
Conclusions:
- The newly developed NSS scale is a reliable instrument for evaluating neurological soft signs.
- NSS are linked to the clinical progression of disorders and specific neuroanatomical findings.
- The findings support the utility of NSS in understanding the neurobiological underpinnings of psychiatric conditions.